[cisco-voip] CME 3.3 and 79xx phones with clock drift

[Lawrence E. Bakst]

All,

1. I am running CME (Call Manager Express) version 3.3.

2. The time on the CME router is correct. The router is running NTP.

3. It seems that the phones under CME 3.3 SCCP DO NOT get the time from CME.

4. I have seen the time off by over 4 minutes from what is on the router.

5. I mentioned the SIP bug because it is similar to what I am seeing, but I am running SCCP. The SCCP loads I am running were mentioned in the original post.

When you say the phone "get their time from CMM/CME" do you know how that works?

Best,

leb


At 9:56 AM -0500 10/31/06, Ryan Ratliff wrote:
>I missed the fact that you are using CME before but the fact remains that SCCP phones get their time from CCM/CME.  Stop the router's time from drifting and you'll fix the phones.
>
>-Ryan
>
>On Oct 31, 2006, at 9:53 AM, Jason Aarons ((US)) wrote:
>
>Lawrence references SIP with CME 3.3, but I didn't know SIP loads were a
>feature of CME.  Perhaps the bug id doesn't match his scenario, that he
>is using SCCP 7900s with CME, and needs his router to sync to a NTP
>source.
>
>I've never seen SCCP phones drift except when the NTP source that CCM is
>using have problems! I once had a server with a bad time clock; the time
>would be all over the place, we had to quickly replace it as Kerberos
>was freaking out causing people to be unable to login to the domain as
>our Domain Controllers pointed to it.
>
>
>-----Original Message-----
>From: cisco-voip-bounces at puck.nether.net
>[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ryan Ratliff
>Sent: Tuesday, October 31, 2006 9:01 AM
>To: Lawrence E. Bakst
>Cc: cisco-voip at puck.nether.net
>Subject: Re: [cisco-voip] CME 3.3 and 79xx phones with clock drift
>
>The phones get the time from CCM.  Pretty much every time you make a
>call the time is updated from CCM to the phone so fix the drift on
>the CCM and you'll fix the phones.
>
>-Ryan
>
>On Oct 30, 2006, at 8:24 PM, Lawrence E. Bakst wrote:
>
>Is there any way to prevent clock drift with 79xx phone under CME
>3.3? My CME router is synced to NTP so the router's time is correct,
>but after weeks or months of uptime the clocks on the phones drift. I
>am using SCCP but I found the following SIP bug:
>
>CSCef38121: Cisco 79x0: NTP Clock drift on SIP Phones
>Symptom: The Cisco 7940/7960 phones exhibit a clock drift issue
>Workaround: A phone reset will restart the time clock.
>
>Has this been fixed in any latter versions? Is it too much to ask
>that the phones would run NTP? It doesn't seem like they do.
>
>I am running the following loads:
>  load 7960-7940 P00306000500
>  load 7920 cmterm_7920.4.0-02-01
>  load 7970 TERM70.6-0-3SR1S
>
>Best,
>
>leb
>
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